So based off my photo below I believe the Walmart .88 tests work better, as in detect earlier. So I would very much recommend buying the cheap ones rather than the more expensive.

What I did was I first bought the frer took it 10dpo got a vvvvvfl and just have felt off this whole month. The next day (11dpo) I bought a Walmart cheapie and the vfl was much easier to see than the frer. And as you can see today I'm 12dpo and there is a much more noticeable faint line on the frer but on the Walmart one it's almost as dark as the control line:)